/*
 * Copyright (C) 2007-2015 FBReader.ORG Limited <contact@fbreader.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301, USA.
 */

package org.geometerplus.zlibrary.core.language;

import org.geometerplus.zlibrary.core.filesystem.ZLFile;
import org.geometerplus.zlibrary.core.filesystem.ZLResourceFile;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
import java.util.Locale;
import java.util.TreeSet;

public abstract class ZLLanguageUtil {
    private static ArrayList<String> ourLanguageCodes = new ArrayList<String>();

    private ZLLanguageUtil() {
    }

    public static String defaultLanguageCode() {
        return Locale.getDefault().getLanguage();
    }

    public static List<String> languageCodes() {
        if (ourLanguageCodes.isEmpty()) {
            TreeSet<String> codes = new TreeSet<String>();
            for (ZLFile file : patternsFile().children()) {
                String name = file.getShortName();
                final int index = name.indexOf("_");
                if (index != -1) {
                    String str = name.substring(0, index);
                    if (!codes.contains(str)) {
                        codes.add(str);
                    }
                }
            }
            codes.add("id");
            codes.add("de-traditional");

            ourLanguageCodes.addAll(codes);
        }

        return Collections.unmodifiableList(ourLanguageCodes);
    }

    public static ZLFile patternsFile() {
        return ZLResourceFile.createResourceFile("read_engine/languagePatterns");
    }
}
